Journal
CHINESE SCIENCE BULLETIN
Volume 55, Issue 15, Pages 1520-1528Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-010-3091-x
Keywords
Yangtze River; late Cenozoic; detrital zircon; U-Pb age; provenance
Categories
Funding
- National Natural Science Foundation of China [40830107]
- IGCP-581 Project
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Detrital zircon grains of Late Cenozoic sediments dated back to ca. 3.6 Ma from core DY03 in the Yangtze delta were dated by LA-ICP-MS, in order to investigate the sedimentary provenance and to find some clue for the evolution of the Yangtze River. Most of the detrital zircon U-Pb ages are distributed at 100-300 Ma, 350-550 Ma, 600-1000 Ma, 1400-2000 Ma and 2200-2800 Ma, which correspond well with the main tectonic and magmatic events in the Yangtze drainage. The detrital zircon age patterns show distinct difference between the 3 samples below 189.8 m and other 6 above 189.8 m. 43%-55% zircons in the 3 samples below 189.8 m fall within Cretaceous, while ages from 150 to 2800 Ma are distributed with no obvious peaks, which indicate the sedimentary provenance may be limited to the lower Yangtze drainage. The 6 samples above 189.8 m show similar age patterns, and the ages are relatively evenly distributed, indicating the sedimentary provenance broadened distinctly. All 6 samples deposited later than ca. 3.2 Ma show age information from the upper Yangtze drainage ( including the Emeishan large igneous province), indicating that the Three Gorges may have already been cut through by then.
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